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Family: Colubridae
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Genus: Leioheterodon
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Species: madagascariensis
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Local Names
Menarana
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Region
Sub-Saharan Africa
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Countries
Comoros, Madagascar
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Taxonomy and Biology
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Adult Length: 1.00 m
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General Shape
Medium to large in length, cylindrical, medium to moderately robust bodied snake with a medium length tail. Can grow to a maximum of at least 1.50 metres ( few recorded specimens ). Head is flattened and slightly distinct from neck. Snout is rounded when viewed from above. Eyes are moderately large in size with round pupils. Dorsal scales are smooth. Dorsal scale count 23 - 23 - 19.
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Habitat
Mainly found in tropical rainforest but has been found in drier deciduous forest.
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Habits
Terrestrial and diurnal snake.
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Prey
Feeds on a wide variety of prey including frogs, lizards, birds andsmall mammals.
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Venom
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General: Venom Neurotoxins
Non-venomous
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General: Venom Myotoxins
Non-venomous
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General: Venom Procoagulants
Non-venomous
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General: Venom Anticoagulants
Non-venomous
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General: Venom Haemorrhagins
Non-venomous
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General: Venom Nephrotoxins
Non-venomous
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General: Venom Cardiotoxins
Non-venomous
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General: Venom Necrotoxins
Non-venomous
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General: Venom Other
Non-venomous
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Clinical Effects
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General: Dangerousness
Non-venomous, so no likelihood of envenoming or lethality
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General: Rate of Envenoming: Non-venomous, so essentially all bites should be "dry".
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General: Untreated Lethality Rate: Non-venomous, so no likelihood of envenoming or lethality
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General: Local Effects
Insufficient clinical reports to know, but most likely no local effects, possibly, at most, minor local pain & swelling only
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General: Local Necrosis
Insufficient clinical reports to know, but local necrosis most unlikely
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General: General Systemic Effects
Insufficient clinical reports to know, but systemic effects not expected
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General: Neurotoxic Paralysis
Insufficient clinical reports to know, but unlikely to occur
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General: Myotoxicity
Insufficient clinical reports to know, but unlikely to occur
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General: Coagulopathy & Haemorrhages
Insufficient clinical reports to know, but unlikely to occur
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General: Renal Damage
Insufficient clinical reports to know, but unlikely to occur
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General: Cardiotoxicity
Insufficient clinical reports to know, but unlikely to occur
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General: Other
Insufficient clinical reports to know
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First Aid
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Description: First aid for bites by Colubrid snakes likely to cause either no effects or only mild local effects.
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Details
1. After ensuring the patient and onlookers have moved out of range of further strikes by the snake, the bitten person should be reassured and persuaded to lie down and remain still. Many will be terrified, fearing sudden death and, in this mood, they may behave irrationally or even hysterically. The basis for reassurance is the fact that many venomous bites do not result in envenoming, the relatively slow progression to severe envenoming (hours following elapid bites, days following viper bites) and the effectiveness of modern medical treatment.
2. The bite wound should not be tampered with in any way. Wiping it once with a damp cloth to remove surface venom is unlikely to do much harm (or good) but the wound must not be massaged.
3. All rings or other jewellery on the bitten limb, especially on fingers, should be removed, as they may act as tourniquets if oedema develops.
4. The bitten limb should be immobilised as effectively as possible using an extemporised splint or sling.
5. If there is any impairment of vital functions, such as problems with respiration, airway, circulation, heart function, these must be supported as a priority. In particular, for bites causing flaccid paralysis, including respiratory paralysis, both airway and respiration may be impaired, requiring urgent and prolonged treatment, which may include the mouth to mask (mouth to mouth) technique of expired air transfer. Seek urgent medical attention.
6. Do not use Tourniquets, cut, suck or scarify the wound or apply chemicals or electric shock.
7. Avoid peroral intake, absolutely no alcohol. No sedatives outside hospital. If there will be considerable delay before reaching medical aid, measured in several hours to days, then give clear fluids by mouth to prevent dehydration.
8. If the offending snake has been killed it should be brought with the patient for identification (only relevant in areas where there are more than one naturally occurring venomous snake species), but be careful to avoid touching the head, as even a dead snake can envenom. No attempt should be made to pursue the snake into the undergrowth as this will risk further bites.
9. The snakebite victim should be transported as quickly and as passively as possible to the nearest place where they can be seen by a medically-trained person (health station, dispensary, clinic or hospital). The bitten limb must not be exercised as muscular contraction will promote systemic absorption of venom. If no motor vehicle or boat is available, the patient can be carried on a stretcher or hurdle, on the pillion or crossbar of a bicycle or on someone's back.
10. Most traditional, and many of the more recently fashionable, first aid measures are useless and potentially dangerous. These include local cauterization, incision, excision, amputation, suction by mouth, vacuum pump or syringe, combined incision and suction ("venom-ex" apparatus), injection or instillation of compounds such as potassium permanganate, phenol (carbolic soap) and trypsin, application of electric shocks or ice (cryotherapy), use of traditional herbal, folk and other remedies including the ingestion of emetic plant products and parts of the snake, multiple incisions, tattooing and so on.
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Treatment
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Treatment Summary
These Colubrid snakes are non-venomous, but moderate in size, and could possibly inflict a significant bite with skin penetration. However, based on current (limited) information, envenoming is not expected. Reassure the patient, clean the wound, advise on the possibility of secondary infection (unlikely), give symptomatic care if local symptoms develop. Generally does not warrant admission.
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Key Diagnostic Features
No significant effects, local or systemic, expected.
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General Approach to Management
Most cases will be minor & not require admission.
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Antivenom Therapy
No antivenom available
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